You could get a bit dizzy from this one, but it might come in handy.
Source Dertig Media
Inspired by the B&O Play, I had to make this pattern.
Source Atle Mo
A textured orange background pattern with vertical stripes.
Source V. Hartikainen
Looks like a technical drawing board: small squares forming a nice grid.
Source We Are Pixel8
Vertical lines with a bumpy, yet crisp, feel to it.
Source Raasa
A seamless pattern formed from a sports car on clker.com. To get the tile, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
From drawing in 'Musings in Maoriland', Thomas Bracken, 1890.
Source Firkin
A tile-able background for websites with paper-like texture and a grid pattern layered on top of it.
Source V. Hartikainen
This is so subtle: We’re talking 1% opacity. Get your squint on!
Source Atle Mo
Design drawn in Paint.net, vectorised using Vector Magic and finished in Inkscape.
Source Firkin
Formed by distorting a JPG from PublicDomainPictures
Source Firkin
CC0 remixed from a drawing. Walter Crane, 1914, Firkin.
Source SliverKnight
A dark one with geometric shapes and dotted lines.
Source Mohawk Studios
Might not be super subtle, but quite original in its form.
Source Alex Smith
A seamless pattern formed from cross 4. To get the original tile select the rectangle in Inkscape and use shift-alt-i.
Source Firkin
Like the name says, light and gray, with some small dots and circles.
Source Brenda Lay
Dark pattern with some nice diagonal stitched lines crossing over.
Source Ashton
This background pattern has futuristic look. So, maybe it could be used on websites or blogs dedicated to video games?!
Source V. Hartikainen
From a drawing in 'Hubert Montreuil, or the Huguenot and the Dragoon', Francisca Ouvry, 1873.
Source Firkin
A light brushed aluminum pattern for your pleasure.
Source Tim Ward
To get the tile this is based on, select the rectangle in Inkscape and use shift-alt-i.
Source Firkin
The green fibers pattern will work very well in grayscale as well.
Source Matteo Di Capua
Seamless , tileable CC-0 texture. Created by my own, feel free to use wherever you want!
Source Linolafett
The classic subtle pattern. Sort of wall/brick looking. Or moon-looking?
Source Joel Klein